Key connection for the wireless transmission of messages



April 21, 1925. 1,535,046

0. SCHELLER ET AL KEY CONNECTION FOR THE WIRELESS TRANSMISSION OF MESSAGES Filed Auei. 3 1, 1921 FIG/1.

W/WA

INVEINTOR o'r'ro sonewsn, .ROBERT HERZOG,

Patented Apr. 21, 1925.

UNITED STATES PATENT OFFICE.

OTTO SC'HELLER, OF BERLIN-LICHTERFELDE-VJEST, AND ROBERT HERZOG, OF BERLIN, GERMANY, ASSIGNORS TO C. LORENZ AKTIENGESELLSCHAFT, OF LORENZWEG,

BEBLIN-TEMPELHOF, GERMANY.

KEY CONNECTION FOR THE WIRELESS TRANSMISSION OF IIIESSAGES.

Application filed August 31, 1921. Serial No. 497,281}.

(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. L, 1313.)

p a specification.

This invention relates to a key connection .which permits the load of a generator to be maintained steady. The arrangement is specially advantageous in cases where a uniform withdrawal of energy from a generator is considered important for instance with are light generators and high frequency machines. With are light generators fluctuations of current is detrimental due to the fact that the unequal load causes variations in the number of revolutions of a generator an d consequently alterations in the syntony.

The invention consists in employing a capacity adapted to be inserted in parallel connection with the generator, and by means of said capacity the generator remains uniformly loaded. A key is also provided and where the key is depressed the high fre quency current from the generator flows into the antenna. When the key is open the energy taken up by the antenna is conducted through the loading condenser.

In the path or branch of circuit supplying energy from the generator to the antenna a choke coil is inserted which during the transmission of signals is bridged by means of said key. so that where the key is depressed the generator current can flow into the antenna and when the key is open the current is prevented from flowing into the antenna by the choke coil.

In order that the invention may be clearly understood, we shall proceed to describe the same with reference to the two forms of construction which are diagrammatically shown by way of example in Figures 1 and 2 of the accompanying drawing.

The connection can be carried out as shown on Fig. 1 of the drawing, in which case the high frequency energy of the generator g is conducted on the one hand across the loading condenser-'0, the key 25, the blocking condenser b and back to the generator. On the other hand, the high frequency energy is conducted through antenna A, coils 8, key t, and blocking condenser b. When the key t is open, as shown on Figure 1, the generator is loaded from the condenser 0. When the key is depressed the energy flows into the antenna. The invention can be applied also to a direct connection, differing from the connection shown on Figure 1, in which the generator is situated in the antenna, so that the separate intermediary circuit is suppressed. This connection is shown on Figure 2 in which the same letters of reference indicate the same parts as on Figure 1.

To claim A wireless signal transmission apparatus comprising an antenna, a high frequency generator connected therewith, a condenser adapted to be connected in parallel with the generator, a choke coil normally in series with the generator and antenna, and akey with connections therefor whereby with the key closed the choke coil will be brought into shunt relation to the antenna generator circuit and with the key open the condenser will be connected in parallel to the-generator. f

In testimony whereof we have signed this specification in the presence of two witnesses.

OTTO S CU IEIJTJTGIT. ROBERT HERZOG.

lVitnesses BRUNO LEARWENKA, Lno RUNGs. 

